なぜお風呂のお湯は湯呑みのお湯より冷めにくいの？

Why Your Bath Stays Toasty While Your Teacup Cools in a Flash

Abstract

Bathwater stays warm much longer than a small cup of hot water due to differences in heat capacity and surface area. In this article, written in a friendly tone for high school students, we explore whether the larger heat capacity (from a greater water volume) or the surface area plays a bigger role in keeping bathwater hot. We explain that a ba…